Influenza vaccine efficacy in nursing home outbreaks reported during 1981-1982.
D000368:Aged; D004196:Disease Outbreaks / Q000517:prevention & control*; D006801:Humans; D007252:Influenza Vaccines / Q000627:therapeutic use*; D007251:Influenza, Human / Q000517:prevention & control*; D009735:Nursing Homes; D014481:United States
D007252:Influenza Vaccines